print("I Love PYTHon".lower() )
print("X=Y=Z".split("=") )
print("a apple a day".count("p") )
print("hello world".replace("o","CCC") )
print("LOVE".center(40,"*") )
print("homework".strip("kh") )
print("♥".join("have a nice day"))
print("{0}晚上{1}什么作为{2}好呢？".format("今天","要吃","宵夜"))